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A 31-year-old member asked:

Why do i get hives on arms and behind knees after i sweat?

1 doctor answer5 doctors weighed in
Dr. Jack Mutnick
Allergy and Immunology 17 years experience
Physical Urticaria: These are warmer spots of the body and places we tend to sweat more....Hives can oftentimes afflict these locations. It is nothing abnormal. Stick to loose-fitting and cotton-blend clothing. Oral antihistamines can also help.

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Last updated Sep 28, 2016

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